2025bys | Transient Name Server

RA/DEC (2000)

07:05:18.797 +58:08:39.60

106.328321725 +58.1443333

Type

SN II

Redshift

0.04

Discovery Report Classification Report

Reporting Group

ZTF

Discovering Data Source

ZTF

Discovery Date

2025-02-17 04:12:20.001

TNS AT

Y

Public

Y

Discovery Mag

19.0977

Filter

g-ZTF

Reporter/s

Nabeel Rehemtulla (CIERA, NU), Christoffer Fremling (Caltech), Daniel Perley (LJMU), Theophile du Laz (Caltech) on behalf of ZTF

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)

Spectra

Select	ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type	Assoc. Groups	End prop. period	Remarks
	20551	2025-03-09 21:00:43	LT / SPRAT		Daniel Perley, Jacob Wise, K-Ryan Hinds, Aleksandra Bochenek, Zoe McGrath	Jacob Wise	ZTF	tns_2025bys_2025-03-09_21-00-43.320_LT_SPRAT_ZTF.spec		Object
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), 0 (observed) ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

Clear-

LAST_LAST-Cam

2024-03-04 18:05:28 - 2025-04-18 18:17:04

2460374.2538 - 2460784.26185

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
482566	2025-04-18 18:17:04	2460784.26185	19.57			ABMag	Clear-	LAST_LAST-Cam	400
482565	2024-03-04 18:05:28	2460374.2538			21.87	ABMag	Clear-	LAST_LAST-Cam	5960		[Last non detection]

L-GOTO

GOTO-N_GOTO-1

2025-02-16 02:00:14 - 2025-02-19 23:27:56

2460722.583498 - 2460726.477732

2

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
470051	2025-02-19 23:27:56	2460726.477732	18.76	0.18		ABMag	L-GOTO	GOTO-N_GOTO-1	180
470050	2025-02-16 02:00:14	2460722.583498			19	ABMag	L-GOTO	GOTO-N_GOTO-1	180		[Last non detection]

g-ZTF

P48_ZTF-Cam

2025-02-11 09:10:18 - 2025-02-19 04:38:13

2460717.8821528 - 2460725.693206

5

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
469615	2025-02-19 04:38:13	2460725.693206	18.4404	0.0790894		ABMag	g-ZTF	P48_ZTF-Cam
469614	2025-02-17 04:12:20	2460723.6752315	19.0977	0.145812		ABMag	g-ZTF	P48_ZTF-Cam
471926	2025-02-17 04:12:20	2460723.6752315	19.0977	0.145812	19.9628	ABMag	g-ZTF	P48_ZTF-Cam	30	Robot	Data provided by ZTF, classified by Fink
469613	2025-02-11 09:10:18	2460717.8821528			18.799	ABMag	g-ZTF	P48_ZTF-Cam			[Last non detection]
471925	2025-02-11 09:10:18	2460717.8821528			18.799	ABMag	g-ZTF	P48_ZTF-Cam	30	Robot	[Last non detection] Data provided by ZTF, classified by Fink

orange-ATLAS

ATLAS-MLO_ATLAS-01

2025-02-19 08:36:07 - 2025-02-19 08:36:07

2460725.85841 - 2460725.85841

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
470017	2025-02-19 08:36:07	2460725.85841	18.678	0.111	19.48	ABMag	orange-ATLAS	ATLAS-MLO_ATLAS-01	30	Robot

orange-ATLAS

ATLAS-HKO_ATLAS-02

2025-02-17 09:36:34 - 2025-02-17 09:36:34

2460723.90039 - 2460723.90039

1

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
470016	2025-02-17 09:36:34	2460723.90039			19.21	ABMag	orange-ATLAS	ATLAS-HKO_ATLAS-02	30	Robot	[Last non detection]

AT Reports

ID	Time received (UT)	Sender	Reporter/s	Reporting group	Disc. Data Source	RA	DEC	Discovery date (UT)	Discovery Mag.	Filter	Related files	AT Type	Host name	Internal name	Assoc. Groups	End prop. period	Remarks	ADS Bibcode	Unreal	Auto classification
251852	2025-04-18 18:58:08	LAST_Bot1	R. Konno (WIS),E. A. Zimmerman (WIS),A. Horowicz (WIS) et al.	LAST	LAST	07:05:18.829	+58:08:39.52	2025-04-18 18:17:03.840	19.57	Clear-		PSN			LAST				N
245989	2025-02-25 19:27:53	Fink	Julien Peloton,Anais Moller,Emille E. O. Ishida on behalf of the Fink broker et al.	Fink	ZTF	07:05:18.797	+58:08:39.60	2025-02-17 04:12:20.002	19.0977	g-ZTF		PSN		ZTF25aafrcem	ZTF		Early SN Ia candidate classified by Fink using the public ZTF stream. Object data at https://fink-portal.org/ZTF25aafrcem		N
245158	2025-02-20 08:09:51	GOTO_bot	A. Kumar,G. Ramsay,K. Ackley et al.	GOTO	GOTO	07:05:18.840	+58:08:39.29	2025-02-19 23:27:55.872	18.76	L-GOTO		Other		GOTO25amu	GOTO				N
245141	2025-02-20 05:36:52	ATLAS_Bot1	J. Tonry,L. Denneau,H. Weiland et al.	ATLAS	ATLAS	07:05:18.801	+58:08:39.85	2025-02-19 08:36:06.624	18.678	orange-ATLAS		PSN		ATLAS25bsx	ATLAS				N
244974	2025-02-19 04:51:43	Fritz	Nabeel Rehemtulla (CIERA,NU),Christoffer Fremling (Caltech) et al.	ZTF	ZTF	07:05:18.805	+58:08:39.55	2025-02-17 04:12:20.001	19.0977	g-ZTF		PSN		ZTF25aafrcem	ZTF		Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167).	2025TNSTR.680....1R	N

Classification Reports

ID

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

20551

2025-03-10 10:52:59

Jacob Wise

Jacob Wise (LJMU), Daniel Perley (LJMU), K-Ryan Hinds (LJMU), Aleksandra Bochenek (LJMU), Zoe McGrath (LJMU)

ZTF

SN II

0.04

1

ZTF

Spectrum displays broad hydrogen P-cygni features characteristic of a SN II. Redshift found using host emission lines.

2025TNSCR.948....1W

Spectra

ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type	Assoc. Groups	End prop. period	Remarks
20551	2025-03-09 21:00:43	LT / SPRAT		Daniel Perley, Jacob Wise, K-Ryan Hinds, Aleksandra Bochenek, Zoe McGrath	Jacob Wise	ZTF	tns_2025bys_2025-03-09_21-00-43.320_LT_SPRAT_ZTF.spec		Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 245989 of Group ZTF
Previous RA, DEC: 07:05:18.805, +58:08:39.55 (106.3283561, +58.1443198)
Updated RA, DEC: 07:05:18.797, +58:08:39.60 (106.328321725, 58.1443333)

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